Apparatus for manufacturing cement pipes or the like.



No. 745,291. PATENTED NOV. 24, 1903. B. NULD'NER. APPARATUS FOR MANUFACTURING CEMENT PIPES OR THE LIKE.

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No. 745,291. PATENTED'NOV. 24, 1903;

NULDNBRL APPARATUS FOR MANUFACTURING CEMENT PIPES OR THE LIKE.

APPLICATION FILED 001224, 1902.

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UNITED STA ES Patented November 24, 1903;

PATENT Carton.

BRUNO NoLDNER, or BRESLAU, GERMANY, ASSIGNORIOF ONE-HALF TO MAX KOHL, OF BRESLAU, GERMANY. I

APPARATUS FOR MANUFACTURING CEMENT PIPES OR THE LIKE.

- 1 SPECIFICATION forming part of Letters Patent No. 745,291, dated November 24, 1903;

Application filed October 24, 1902. Serial No. 123,597. (No model.)

To (ZZZ whom it may concern:

Be it known that I, BRUNO NoLDNER, a subject of the Emperor of Germany, residing at 18 Ohlauerstrasse, Breslau, Germany, have invented certain new and useful Improve ments in Apparatus for Manufacturing Oement- Pipes or the Like; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to an apparatus for manufacturing cement pipes and the like in I which when the core or casing is rotated side pressure is applied to the material to be pressed.

Hollow molds with double sides for making cement pipes are already known in which pressure is applied laterally to the material by means of the radial displacement ofthe hollow core, which consists of several parts. The pressure applied to the material by means of the radial displacement of the core is, however, uniform at all points of the circumference of the core, and consequently it is not possible to effect uniform compression of thematerial unevenly distributed between the core and the casing, the material remaining unequally distributed after the pressing operation,the parts with compact layers receiving the principal part of the pressure, while in places where the layers are less compact only a slight pressure is exercised.

and the casin g.

This invention is intended to obviate these disadvantages and to insure the material being uniformly distributed between the core For this purpose a pressing piece with curved pressing-surface is arranged on the core or the casing, this curved surface becoming gradually farther from the center of the core. is rotated, the pressing-piece first penetrates into those places in the material'which are at the shortest distance from the center of the core and exercises a slight pressure on the layer of the material adjoining the spot where the pressure is exerted, this slight pressure gradually increasing as the pressingpiece continues moving. The material lying in front of the pressing-piece in the direction of the motion is removed when the layer is When the core or casing too com pact and is pressed into a layer which is not so compact. Consequently any uneven spaces between the particles of the material are uniformly filled up by the due distribution of the material between the core and the casing, so that when the radial pressure'is efiected the sides of the pipe are made uniformly compact in all parts. I

In the drawings a particular example of the invention is illustrated in which the pressing-piece is made in the form ofa screw and the core is moved longitudinally in relation to the casing. The drawings also show aform 1 of construction wherein the casing is rotated.

Figure 1 is a longitudinal section; Fig. 2, a section along the line A B in Fig. 1. Fig. 3 is a vertical sectional view showinga modification, and Fig. 4 is a horizontal section on line C D of Fig. 3.

The core consists of a thick part a and a thin part 19, between which the pressing-piece o is arranged, the diameter of the pressingpiece gradually increasing from b to a Whenthe core is rotated, the pressing-piece c gradually enters the material between the core and the casing, the material being compressed to the extent of the difference between o and b and at the same time uniformly distributed.

In Figs. 3 and 4: I show a modification of the invention wherein the pressing-piece g is arranged on the casing, which latter consists of a wide part 6 and a narrow part f, between which parts the pressing-pieceis arranged, 85 the diameter of this latter gradually diminishing from c tof hindicates the core. When 7 the casing is rotated, the pressing-piece g moves gradually in the material between the core and the casing, the material being com- 0 pressed to the extent of the difference betweene and f and uniformly spread.

What I claim, and desire to secure by Letters Patent, is-

1. In an apparatus for manufacturing ce- 5 ment pipes, the combination of an outer casing, an inner core, one of said parts being rotatable, and a pressing-piece having the shape of a conical screw carried by the rotatable, part, the said pressing-piece havinga curved I00 pressing-surface which has a gradually-varying diameter.

In testimony whereof I have affixed my signature in presence of two Witnesses.

BRUNO NULDNER.

YVi tnesses:

ERNST KATZ, ALBERT SCHENK. 

